Dunstan, Maine, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Dunstan, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Dunstan lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Dunstan — soil, climate, flood, and parcel records. How we handle your address.
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Dunstan — the short answer
Dunstan, Maine: USDA zone 6a, about 201 days between hard freezes, across 2K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~201
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 6a is Dunstan's average, not your lot's — a low corner or a tree line moves it. Against Dunstan's 201-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dunstan
Each reading below is measured for Dunstan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDunstan runs about 201 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredDunstan sits in USDA hardiness zone 6a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Dunstan is in
Dunstan sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dunstan's own centroid rather than borrowed from Cumberland County.
What Grows in Dunstan
Every plant below cleared Dunstan's own zone 6a and its 201-day season. Each card opens that plant's Maine profile. How we score.
Is it too late to plant in Dunstan?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 11 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Dunstan
Survey cells within 31 miles of Dunstan checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 49 miles off. What to watch for.
What's on the federal record near Dunstan
Closest first, within ~10 miles of Dunstan. Listing isn't leaking, and distance isn't exposure.
- GLOBAL MONTELLO GROUP 603Underground Storage Tanks · 700 ft
- WALGREENS 18299Brownfields · 850 ft
- MAINE DEPARTMENT OF TRANSPORTATIONBrownfields · 1700 ft
- OLIVER VENDING & MUSIC SYSTEMSUnderground Storage Tanks · 1900 ft
- PINE POINT CENTERBrownfields · 2200 ft
- EXXON CO USA 36340Brownfields · 0.8 mi
- FLAHERTYS FARMUnderground Storage Tanks · 1.1 mi
- ABBOTT DIAGNOSTICS SCARBOROUGH INC. - 10 SOUTHGATEBrownfields · 1.3 mi
- TRACTOR SUPPLY COMPANY # 1197Brownfields · 1.3 mi
- ALLEN SCREEN PRINTINGBrownfields · 1.3 mi
- LUCIEN BISSON INCUnderground Storage Tanks · 1.4 mi
- FIELDINGS OIL & PROPANE CO INCUnderground Storage Tanks · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dunstan's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Dunstan.
Sources Checked
within ~10 miles of Dunstan
Severity Distribution
within ~10 miles of Dunstan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dunstan, Superfund runs higher than the national average — 15 sites within ~10 miles of Dunstan. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Dunstan
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Dunstan average
Your land is one point inside Dunstan
Everything above resolves to Dunstan as a whole — one PHZM band and one 28°F frost record, read across 2K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Dunstan Average
Dunstan Average
- ●USDA Zones 6a, averaged across Dunstan
- ●One soil character for all of Dunstan
- ●Frost dates read at Dunstan's scale: Apr 11 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Dunstan's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dunstan
Pull a site-specific report for your exact address in Dunstan, Maine — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dunstan averages can't show:
We read public map data around Dunstan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dunstan average
How we know this about Dunstan
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Dunstan’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Dunstan
When does frost risk typically end in Dunstan?
The last hard freeze (28°F) in Dunstan typically lands around Apr 11, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 2.
When is the first frost in Dunstan?
The first hard freeze (28°F) in Dunstan typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 201 days after the spring freeze cleared.
How long is the growing season in Dunstan?
Measured between 28°F hard freezes, Dunstan sees about 201 frost-free days — roughly Apr 11 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 2 to Oct 15, about 166 days.
Is the soil safe to grow vegetables in Dunstan?
The federal record around Dunstan is a meaningful one — 1,135 documented sites, mostly Underground Storage Tanks entries (583), the nearest Underground Storage Tanks record about 0.1 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Dunstan?
From about Sep 29 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 29 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dunstan's scale — its 6a band and its 201-day season. Your yard writes its own version of Dunstan's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Dunstan’s own scale
7 of the readings below were taken at Dunstan's own scale — its own ~201-day season between 28°F freezes, the 2,024 acres it covers and 1,135 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dunstan's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Dunstan's own 28°F hard-freeze dates, about Apr 11 and Oct 29 and the ~201-day span between themNOAA 1991–2020 Climate Normals
- 1,135 documented contamination sites on the federal record near Dunstan, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Dunstan's boundary and the 2,024 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~201-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dunstan's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- Lanternfly survey cells around Dunstan checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dunstan's 2,024 acres read through its county's SSURGO summaryfrom Cumberland County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cumberland County
- The growing challenges every Maine grower plans around — written at state scale, so they stay on the state guidefrom Maine
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Cumberland County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dunstan's 2,024 acreswhy one lot differs from the next →
- Which side of Dunstan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,024 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Dunstan-wide figureread your own land →
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